.main {
    margin-top: 64px;
}
.course-nav {
    height: 54px;
    width: 100%;
    background: #f2f2f2;
    box-shadow: 0 4px 5px rgba(0, 0, 0, .1);
}
.course-nav .nav-container {
    width: 1170px;
    margin: 0 auto;
    overflow: hidden;
    line-height: 54px;
}
.course-nav .nav-container .title {
    float: left;
    color: #696969;
    font-size: 24px;
}
.course-nav .nav-container .nav-list {
    float: left;
    overflow: hidden;
    margin-left: 100px;
}
.course-nav .nav-container .nav-list li {
    float: left;
    margin-right: 40px;
}
.course-nav .nav-container .nav-list .active a {
    color: #212121;
}
.course-nav .nav-container .nav-list li a {
    color: #888;
}

.wrapper {
    margin: 0 auto;
    width: 1070px;
    margin-top: 20px;
}
.course-detail {
    background: #fff;
}
.course-detail .course-info {
    padding: 20px;
}
.course-detail .course-info .title {
    color: #212121;
    font-size: 20px;
}
.course-detail .course-info .share-buy {
    margin-top: 20px;
    overflow: hidden;
}
.course-detail .course-info .share-buy .share .title {
    color: #878787;
    font-size: 14px;
    float: left;
}
.course-detail .course-info .share-buy .share {
    float: left;
    overflow: hidden;
}
.course-detail .course-info .share-buy .buy {
    float: right;
}
.share-buy .buy .price {
    font-size: 16px;
}
.share-buy .buy .free {
    color: #7ed321;
}
.share-buy .buy .pay {
    color: #f76363;
}
.course-info .share-buy .share .weixin {
    float: left;
    width: 28px;
    height: 28px;
    background: url("https://www.xfz.cn/static/build/images/share.png") no-repeat;
    background-size: 180%;
background-position: 0 1px;
}
.course-info .share-buy .share .weibo{
    float: left;
    width: 28px;
    height: 28px;
    background: url("https://www.xfz.cn/static/build/images/share.png") no-repeat;
    background-position: -28px 1px;
    background-size: 180%
}
.share-buy .buy .buy-btn {
    display: inline-block;
    color: #fff;
    background: #ff8d3f;
    height: 40px;
    width: 120px;
    /*padding: 10px 20px;*/
    text-align: center;
    line-height: 40px;
    border-radius: 5px;
    margin-left: 20px;
}

.video-group {
    width: 100%;
    height: 600px;
    background: skyblue;
}

.bottom-wrapper {
    margin-top: 20px;
    overflow: hidden;
}
.course-intr {
    float: left;
    width: 700px;
}
.course-intr .item {
    background: #fff;
    padding: 20px;
    margin-bottom: 20px;
    box-sizing: border-box;
}
.course-intr .item .title {
    color: #212121;
    font-size: 18px;
    border-left: 5px solid #5c87d9;
    padding-left: 16px;
}
.course-intr .item .teacher {
    margin-top: 20px;
    overflow: hidden;
}
.course-intr .item .teacher .t-image {
    float: left;
    height: 60px;
    width: 60px;
}
.course-intr .item .teacher .t-image .t-image-add {
    width: 100%;
    height: 100%;
    border-radius: 50%;

}
.course-intr .item .teacher .name-professional {
    float: left;
    margin-left: 10px;
    color: #696969;
    font-size: 14px;
}
.course-intr .item .teacher .name-professional .professional {
    margin-top: 16px;
}
.item-content {
    margin-top: 20px;
    color: rgb(68,68,68);
    line-height: 1.8;
}
.recommend {
    width: 355px;
    float: right;
    padding: 20px;
    box-sizing: border-box;
    background: #fff;
}
.recommend .title {
    color: #212121;
    font-size: 18px;
}
/*.recommend .re-course-list {*/
/*    margin-top: 20px;*/
/*}*/
.recommend .re-course-list li {
    overflow: hidden;
    padding: 20px 0;
    border-bottom: 1px solid #c9c9c9;
}
.recommend .re-course-list li .re-info .re-info-title {
    color: #212121;
    font-size: 16px;
}
.recommend .re-course-list li .re-info .re-teacher {
    position: absolute;
    bottom: 0;
    color: #878787;
    font-size: 14px;
}
.recommend .re-course-list li .re-info {
    float: left;
    width: 150px;
    height: 90px;
    position: relative;
}
.recommend .re-course-list li .re-image {
    float: right;
    width: 160px;
    height: 90px;
}
.recommend .re-course-list li .re-image .re-image-add {
    width: 100%;
    height: 100%;
}